{"id":807,"date":"2019-05-14T18:16:38","date_gmt":"2019-05-14T16:16:38","guid":{"rendered":"https:\/\/www.zeterinaires.fr\/nofakemed\/?p=807"},"modified":"2020-01-29T10:32:00","modified_gmt":"2020-01-29T09:32:00","slug":"inversion-de-lhypothese-nulle","status":"publish","type":"post","link":"https:\/\/www.zeterinaires.fr\/nofakemed\/2019\/05\/14\/inversion-de-lhypothese-nulle\/","title":{"rendered":"Inversion de l&rsquo;hypoth\u00e8se nulle"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"807\" class=\"elementor elementor-807\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5dd9c7d3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5dd9c7d3\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5de7f365\" data-id=\"5de7f365\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-374b51d7 elementor-widget elementor-widget-text-editor\" data-id=\"374b51d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p>\n<p style=\"text-align: left;\">On a vu dans le billet <a href=\"https:\/\/www.zeterinaires.fr\/nofakemed\/index.php\/2019\/04\/28\/cest-quoi-un-petit-p\/\">\u00ab C&rsquo;est quoi un petit p ? \u00bb<\/a> ce qu&rsquo;\u00e9tait l&rsquo;hypoth\u00e8se nulle. On a vu aussi dans l&rsquo;un des exemples donn\u00e9s que cette hypoth\u00e8se nulle ne devait pas \u00eatre choisie n&rsquo;importe comment. Au risque de faire une inversion de charge de la preuve c&rsquo;est \u00e0 dire une \u00ab inversion de l&rsquo;hypoth\u00e8se nulle \u00bb.<\/p>\n<p><\/p>\n<p><\/p>\n<p>En m\u00e9decine par d\u00e9faut tout est faux, donc l&rsquo;hypoth\u00e8se nulle H0, c&rsquo;est l&rsquo;hypoth\u00e8se o\u00f9 un \u00ab\u00a0truc\u00a0\u00bb est faux et ce sont les preuves qui me permettront de conclure si l&rsquo;hypoth\u00e8se alternative H1 est vraie en rejetant H0. Par exemple H0, \u00e7a pourrait \u00eatre \u00ab ces deux traitements sont \u00e9quivalents \u00bb ou bien \u00ab la gu\u00e9ritoumycine\u00ae ne fonctionne pas sur les maladies respiratoires infectieuses bact\u00e9riennes des bovins \u00bb<strong>.<\/strong><\/p>\n<p><\/p>\n<p><\/p>\n<p>Donc si quelqu&rsquo;un me dit \u00ab il existe des corbeaux blancs et prouve-moi qu&rsquo;ils n&rsquo;existent pas ! \u00bb, il s&rsquo;agit d&rsquo;une inversion de la charge de la preuve. J&rsquo;aurai beau retourner la Terre enti\u00e8re pour montrer qu&rsquo;il n&rsquo;y a pas de corbeau blanc, que je n&rsquo;en ai pas trouv\u00e9, ce quelqu&rsquo;un me r\u00e9pondra \u00ab c&rsquo;est parce que tu n&rsquo;as pas bien cherch\u00e9 \u00bb. Il m&rsquo;est impossible de prouver que les corbeaux blancs n&rsquo;existent pas. Par contre, celui qui l&rsquo;affirme peut assez facilement le faire : il suffit qu&rsquo;il apporte deux corbeaux blancs (Ben oui deux puisque l&rsquo;affirmation c&rsquo;est il existe DES corbeaux&#8230; \ud83d\ude09 ). Il y a bien au d\u00e9part une inversion de la charge de la preuve.<\/p>\n<p><\/p>\n<p><\/p>\n<p>De mani\u00e8re formelle, on peut exprimer le probl\u00e8me de la mani\u00e8re suivante : l&rsquo;hypoth\u00e8se H0 c&rsquo;est \u00ab il existe des corbeaux blancs \u00bb et l&rsquo;hypoth\u00e8se alternative H1 est \u00ab l&rsquo;absence de corbeaux blancs \u00bb. Aucune preuve ne pourra \u00eatre assez solide pour rejeter H0 avec une p-valeur acceptable. On comprend que c&rsquo;est conceptuellement impossible. L&rsquo;inverse au contraire est assez facile : on a invers\u00e9 l&rsquo;hypoth\u00e8se nulle.<\/p>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">Et c&rsquo;est grave?<\/h4>\n<p><\/p>\n<p><\/p>\n<p>Ben oui parce que c&rsquo;est la porte ouverte \u00e0 n&rsquo;importe quelle assertion.<\/p>\n<p><\/p>\n<p><\/p>\n<ul class=\"wp-block-list\">\n<li><em>Les grigris soignent la gale sarcoptique.<\/em><\/li>\n<li><em>C&rsquo;est prouv\u00e9 \u00e7\u00e0 ?<\/em><\/li>\n<li><em>En tout cas on n&rsquo;a jamais d\u00e9montr\u00e9 le contraire&#8230; <\/em><\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<p>Absurde, n&rsquo;est-ce pas? Et en plus se pose le probl\u00e8me de la d\u00e9monstration de l&rsquo;inexistence d&rsquo;une chose. C&rsquo;est quasi-impossible.<\/p>\n<p><\/p>\n<p><\/p>\n<p>Donc en m\u00e9decine, par principe tout est faux ou \u00e9quivalent, et c&rsquo;est en rejetant cette affirmation \u00e0 l&rsquo;aide de preuves qu&rsquo;on d\u00e9montre l&rsquo;existence d&rsquo;un fait, d&rsquo;un m\u00e9canisme, etc. Cependant attention : toutes les preuves ne sont pas \u00e9quivalentes en terme de robustesse.<\/p>\n<p><\/p>\n<p><\/p>\n<h4 class=\"wp-block-heading\">L&rsquo;explication en vid\u00e9o<\/h4>\n<p><\/p>\n<p><\/p>\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=8e29AWMrcRM\">M\u00e9difact en parle tr\u00e8s bien sur youtube <\/a><\/li>\n<\/ul>\n<p><\/p>\n<p><\/p>\n<div class=\"wp-block-image\">\n<figure class=\"alignright is-resized\"><a href=\"https:\/\/www.youtube.com\/channel\/UCOhW7sWI8IeAi0ZYe-P3qRg\"><img decoding=\"async\" src=\"https:\/\/yt3.ggpht.com\/a\/AGF-l7-OZT9oXKevGLqtaFvfAi8ZIXQlA3B6X-wygQ=s288-mo-c-c0xffffffff-rj-k-no\" alt=\"logo m\u00e9difact\" width=\"147\" height=\"147\" \/><\/a>\n<p>\u00a0<\/p>\n<figcaption>Cr\u00e9dit m\u00e9difact\n<p>\u00a0<\/p>\n<\/figcaption>\n<\/figure>\n<\/div>\n<p><\/p>\n<p><\/p>\n<p class=\"has-small-font-size\"><em>Cr\u00e9dit photo : J\u00e9r\u00f4me Chantreau<\/em><\/p>\n<p><\/p>\n<p><\/p>\n<p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>On a vu dans le billet \u00ab C&rsquo;est quoi un petit p ? \u00bb ce qu&rsquo;\u00e9tait l&rsquo;hypoth\u00e8se nulle. On a vu aussi dans l&rsquo;un des exemples donn\u00e9s que cette hypoth\u00e8se nulle ne devait pas \u00eatre choisie n&rsquo;importe comment. Au risque de faire une inversion de charge de la preuve c&rsquo;est \u00e0 dire une \u00ab inversion&hellip;<\/p>\n","protected":false},"author":3,"featured_media":816,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":51,"footnotes":""},"categories":[97],"tags":[42,43,23,26],"class_list":["post-807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pedagogie","tag-hypothese","tag-inversion","tag-preuve","tag-statistique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Inversion de l&#039;hypoth\u00e8se nulle - Z\u00e9t\u00e9rinaires<\/title>\n<meta name=\"description\" content=\"L&#039;inversion de charge de la preuve, erreur fr\u00e9quente dans les discussions sur l&#039;efficacit\u00e9 des traitements, est li\u00e9e \u00e0 l&#039;inversion de l&#039;hypoth\u00e8se nulle.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.zeterinaires.fr\/nofakemed\/2019\/05\/14\/inversion-de-lhypothese-nulle\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Inversion de l&#039;hypoth\u00e8se nulle - 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